Index: /trunk/src/VBox/VMM/VMMR0/HMSVMR0.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR0/HMSVMR0.cpp	(revision 56663)
+++ /trunk/src/VBox/VMM/VMMR0/HMSVMR0.cpp	(revision 56664)
@@ -4802,6 +4802,7 @@
         {
             uint64_t cbInstr = pVmcb->ctrl.u64ExitInfo2 - pCtx->rip;
-            if (cbInstr <= 15 && cbInstr >= 2)
+            if (cbInstr <= 15 && cbInstr >= 1)
             {
+                Assert(cbInstr >= 1 + IoExitInfo.n.u1REP);
                 if (IoExitInfo.n.u1Type == SVM_IOIO_WRITE)
                 {